Adding custom tasks to run before or after bump and release

You can now use `beforeBump`, `afterBump`, `beforeRelease` and
`afterRelease` as arrays in config to run grunt tasks accordingly.

Closes #98.
Reference #6.

README.md

@@ -151,6 +151,10 @@ The following are all the release steps, you can disable any you need to:
       tagName: 'some-tag-<%= version %>', //default: '<%= version %>'
       commitMessage: 'check out my release <%= version %>', //default: 'release <%= version %>'
       tagMessage: 'tagging version <%= version %>', //default: 'Version <%= version %>',
+      beforeBump: [], // optional grunt tasks to run before file versions are bumped
+      afterBump: [], // optional grunt tasks to run after file versions are bumped
+      beforeRelease: [], // optional grunt tasks to run after release version is bumped up but before release is packaged
+      afterRelease: [], // optional grunt tasks to run after release is packaged
       github: {
         repo: 'geddski/grunt-release', //put your user/repo here
         usernameVar: 'GITHUB_USERNAME', //ENVIRONMENT VARIABLE that contains Github username

tasks/grunt-release.js

@@ -62,7 +62,11 @@ module.exports = function(grunt){
       push: true,
       pushTags: true,
       npm: true,
-      remote: 'origin'
+      remote: 'origin',
+      beforeReleaseTasks: [],
+      afterReleaseTasks: [],
+      beforeBumpTasks: [],
+      afterBumpTasks: []
     }, (grunt.config.data[this.name] || {}).options);
     var config = setup(options.file, type);
 
@@ -238,8 +242,30 @@ module.exports = function(grunt){
       return deferred.promise;
     }
 
+    function runTasks(taskName) {
+      var map = {
+        beforeBump: 'beforeBumpTasks',
+        afterBump: 'afterBumpTasks',
+        beforeRelease: 'beforeReleaseTasks',
+        afterRelease: 'afterReleaseTasks'
+      };
+      return function () {
+        var method = map[taskName],
+          tasks = options[method];
+        if (tasks.length) {
+          grunt.log.ok('running ' + method + ' ');
+          if (!nowrite) {
+            grunt.task.run(tasks);
+          }
+        }
+      }
+    }
+
     new Q()
+      .then(ifEnabled('beforeBumpTasks', runTasks('beforeBump')))
       .then(ifEnabled('bump', bump))
+      .then(ifEnabled('afterBumpTasks', runTasks('afterBump')))
+      .then(ifEnabled('beforeReleaseTasks', runTasks('beforeRelease')))
       .then(ifEnabled('changelog', changelog))
       .then(ifEnabled('add', add))
       .then(ifEnabled('commit', commit))
@@ -248,6 +274,7 @@ module.exports = function(grunt){
       .then(ifEnabled('pushTags', pushTags))
       .then(ifEnabled('npm', publish))
       .then(ifEnabled('github', githubRelease))
+      .then(ifEnabled('afterReleaseTasks', runTasks('afterRelease')))
       .catch(function(msg){
         grunt.fail.warn(msg || 'release failed');
       })